Safety-hook for logs



M. H. GIBERSON. SAFETY HOOK FOR LOGS.

APPtlCATlON men MAY I3, 1920.

1,373,235. Patented Mar. 29, 1921.

I IN V EN TOR.

77Z. Giberdoiv,

A TTORNEYSL MURPHY H. GIBERSON, OF MILTON, WASHINGTON.

SAFETY-HOOK FOR LOGS.

Specification of Letters Patent. Patented lliitk'. 29, 1921.

Application filed May 13, 1920. Serial No. 381,007.

To all whom it may concern:

Be it known that I, MURPHY H. G'IBERSON, a citizen of the United States, residing at Milton, in the county of Pierce and State of WVashington, have invented certain new and useful Improvements in Safety-Hooks for Logs, of which the following is a specification. e

My invention relates to safety hooks and while it is applicable to hooks for various uses it is particularly adapted for use in connections employed in dragging logs in lumbering districts from the point of source to a skidway. o

It is my purpose to provide a safety hook of this general type which embodies improved means for locking the pivoted tongue of the hook to the bill, said means being so constructed and arranged that the possibility of the tongue becoming detached from the bill during the dragging of a log, as the result of engagement with obstructions, is reduced to a minimum. I

It is also my purpose to provide a locking connection between the tongue and bill of the hook which besides having the utility of'being substantially immune against acci dental release, will also be easy to manually lock and unlock for the purpose of establishing theclosed or open status of the hook.

With the above and other purposes in view the invention consists in the details of construction and in the arrangement and combination of parts to be hereinafter more fully described and particularly pointed out in the appended claims.

In describing the invention in detail reference will be had to the accompanying drawings wherein like characters of reference denote corresponding parts in the several views, and in which Figure 1 is a side elevation partly in section of p a hook constructed in accordance with my invention and showing the position of the parts during the closed status of the hook;

Fig. 2, a view similar to Fig. 1 showing the position of the parts during the open status of the hook;

Fig. 3, a perspective view of the inner locking sleeve;

Fig. 4, a perspective view of the outer locking sleeve; and

Fig. 5, a section on the line 55 of Fig. 1.

Referring to the drawing my improved hook is shown as comprising a shank 10, a

bill 11, and a pivoted tongue 12 which is adapted to be-swung into and out of alinement with the bill to establish the closed or open status of the hook.

Rotatably and slidably mounted on the tongue 12 is an inner locking sleeve 13 which is enlarged at its outer end to form a shoulder 14 while its inner end is provided with a recess 15. To prevent disengagement of the sleeve 13 from the tongue 12 I enlarge a portion of the bore thereof to form an interior shoulder 16 and thread on the free end of the tongue a nut 17 forming a shoulder 18 with which the shoulder 16 engages upon predetermined sliding movement of the sleeve 13 in the direction of the free end of the tongue, the enlarged portionof the bore of the sleeve 13 providing for predetermined movement of the latter. over the nut 17 NVhen the sleeve 13 is in unlocked position as shown in Fig. 2 an abutment 18 on the tongue fills the recess 15. Upon alining the tongue 12 with the bill 11 and moving the sleeve longitudinally, said sleeve enters 1nt0v telescopic relation with the reduced portion 19 on the bill and thereby locks the tongue to the bill and establishes the closed status of the hook. After the sleeve has been moved to locked position the abutment 18 is disposed entirely without the recess 15 thus permitting axial rotation of the sleeve to disaline the recess and abutment when the latter will co-act with the inner end of the sleeve to prevent movement thereof to unlocked position.

To further provide against the possibility of accidental unlocking of the hook as the result of engaging obstructions I rotatably and slidably mount on the sleeve 13 a second locking sleeve 19, the outer end of which, in the locked position of this sleeve, abuts the shoulder 14% while the inner end thereof coacts with the abutment 18 and thus positively interposes itself between the shoulder 14 and abutment to prevent movement of the sleeve 13 to unlocked position. A recess 20 is also provided in the inner end of the sleeve 19 which is adapted to be alined with the abutment 18' by axial rotation of the sleeve and thereby permit the latter to be moved to unlocked position, it being obvious that whenever the recess 20 is disposed out of alinement with the abutment unlocking movement of either of sleeves 13 or 19 is impossible even though the recess 15 of the sleeve 13 may be disposed in alinement with said abutment. To effect movement of both sleeves from locked to unlocked position each of the recesses 15 and 20 must be alined with the abutment 18 and the accidental creation of this condition is substantially impossible when the recesses 15 and 20 are initially staggered and disalined respectively with the abutment l8, owing to the tendency of the sleeves 13 and 19 to rotate substantially in unison from the effect of any given impelling force to which one or the other may be subjected.

I claim j 1. In a safety hook, the combination of a bill, a pivoted tongue, a slidable sleeve on the tongue having a shoulder projecting into the bore thereof intermediate itsends, said sleeve being movable into and out of telescopic relation with the bill to close and open the hook when the tongue is alined with the bill, and means on the tongue cooperating with the shoulder in the bore of the sleeve to positively prevent disengagement of the sleeve from the tongue when the latter is out of alinement with the bill.

2. In a safety hook, the combination of a bill, a pivoted tongue, a slidable sleeve on the tongue having a shoulder projecting into the bore thereof intermediate its ends, said sleeve being movable into and out of telescopic relation with the bill to close and open the hook when the tongue is alined with the bill, and a nut threaded on the tongue and formin a shoulder cooperating with the shoulder in the bore of the sleeve to positively prevent disengagement of the sleeve from the tongue when the latter is out of alinement with the bill.

33. In a safety hook, the combination of a bill, a pivoted tongue, a sleeve slidable on the tongue for movement into and out of telescopic relation with the bill when said tongue and bill are in alinement, an exterior shoulder on the sleeve, a second sleeve slidable on the first sleeve, and means for releasably locking the second sleeve against inward movement with respect to the tongue when the outer. end thereof is engaged with said shoulder whereby the first} sleeve is locked against movement out of telescopic relation with the bill by said second sleeve.

4:. In a safety'hook, the combination of a bill, a pivoted tongue, a sleeve slidable on the tongue for movement into and out of telescopic relation with the bill when said tongue and bill are in alinement, a second sleeve slidable on the first sleeve, means for releasably locking the second sleeve against inward movement with respect to the tongue when the first sleeve is in telescopic engagement with the bill, and means coacting with the second sleeve when locked against inward movement on the tongue to lockthe first sleeve against such movement.

5. In a safety hook, the combination of a bill, a pivoted tongue, a rotatable and slidable sleeve on the tongue having a recess in its inner end and an exterior shoulder, said sleeve being movable intoand out of telescopic relation with the bill to close and open the hook, an abutment on the tongue engaging the inner end of the sleeve to hold the same against movement from telescopic relation with thebill and permitting such movement when the sleeve is rotated to dispose the recess in line with the abutment, and a second sleeve slidable and rotatable on the first sleeve having a recess in its inner end for receiving the abutment and interposed between the shoulder on'tlie first sleeve and the abutment when the recess thereof is out of alinement with the abutment to prevent movement of the first sleeve from telescopic relation with the bill.

In testimony whereof I hereunto affix my signature in the presence of two witnesses.

MURPHY H. GIBERSON.

Witnesses MARTHA F. LODGE, FLORENCE E. LODGE. 

